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Two different types of injection-molding machines are used to form plastic parts. A part is considered...

Two different types of injection-molding machines are used to form plastic parts. A part is considered defective if it has excessive shrinkage or is discolored. Two random samples, each of size 300, are selected, and 18 defective parts are found in the sample from machine 1, and 6 defective parts are found in the sample from machine 2.

a) Construct a 95% confidence interval on the difference in fraction defectives.

b) Discuss what practical conclusions you would draw in part

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